My experiments pretty much proved that the following would happen:
a) Leave batteries in overnight - handset display says they're full.
b) Pull batteries out momentarily & put them back in
c) Now handset display says (the same batteries) need 7 hours of charging
So, I'm going with the recommendation to ignore whatever the handset
display says if you've just put in batteries.

I'm having this same problem, and re-registering the handset works for abou
t two days before the problem recurs. After reading a number of complaints
on the web from other owners of these phones, I've ordered new Sanyo NiMH
batteries to replace the OEMs. I'll report back later.

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